Gear-cutting tool.



S. SUNDBRLAND.

GEAR UTTING TOOL.

APPLIUATION FILED 1350.31.1912.

1,090,350. Patented Mar. 17, 1914.

2 SHBETS-SKEET l.

b'. SUNDERLAND.

GEAR CUTTING fOOL.

APPLlcATmN FILED Dnc. 31. 19124 1,090,350. Patented Mar.17,1914.

2 SHEBTSmSHEET 2.

7LN V V267 4 -/7/1 SAM SUNDERLAND, 0F HIGH UTLEY, KEIGI'ILEY,iltilldllll.

Spec-inaction of Letters Patent.

lln rated ll-lnr.. tilt, il@ lfh Application filed 'December 3l.. 19155.Serial Tile. 730,520,

To all whom if; may concern Be it known that I, SAM Simnnnmivn, nsubject oi the King of Great Britain und Ireland, and resident of HighUtley, Keighley, in the county of York, England, huvc invented n certainnew und useful improve ment Relating to Geur-Cutting Tonight which the:following is n specification.

This invention has for its object, the pro` Vision Vof means wherebyhobbing and end milling cutters such as are used tor cutting the teethof double helical wheels may be dispensed with, and in place of such7 tocon struct, mount and operate cutters so thut. the teeth may be pinnedand generated to the correct shape 'for the entire length ci euch tooth,und obtain continuity ot inetul etA the junction of the angles of theteeth meeting in the central plane of the periphery ol Wheel. A

It is Well known among Wheel cuttingl engineers, that the spaces otdouble helical wheels cannot be cut correctly by hohhine; or end millingcutters; in both ceses the wheel teeth are defective in the centralplane et' the peripherl oi. Wheel. "iii/'hen hohbing cutters are lisce,the teeth space cuts from one side of the wheel, extend .into the teethon the opposite side of the wheel, leaving' un annular groove throughthe teeth in the central plane ci' the periphery of wheel, by which thecontinuity of metal forming' the Wheel teeth is destroyed. 'When thespaces are cut with end `milling cutters, the apex on one side oi eachtooth is lett pointedj :ind requires to be trimmed before the 'wheelsWill gear, unless there be un annuler groove cut in the central plane ofwheel, in which, :ase the continuity ot' 'the teeth from one side of theWheel to the other is removed. These detects nre removed hy theemployment of cutters made according to my ini vention, adapted to planeand eenernte the teeth of double helical wheels, when mount ed and.operated in thc manner such ns here-- innilter described.

The drawings illustrate mechanism which may be used 'for carrying ont myinvention in connection with n Wheel cutting rnuehlnc, such ns describedin ruy patent speeitit'auction No. 948,830.

In the drawings, like parts ure indicuted by.lil e references.

In seid drawings, Figure l. reproduits u front elevation oit `mechanismto which inv improved cutters nre attached. ligg.' i2 is u plan of themechanism iittcched to portion ol the before mentioned niechine. Fig.fil is nn end View shown ipartly in section. u

u detached deteil ci the reciprm'ntiiurs pinto by which the cutterslides muy be oper sited. Fig. 5 is nn'elevntion oi'niy improved cuttershowing the cuttinv fece. Fig. u view showing;r the angle of the cuttingteeth und spaces. Fig. 7 en end View of the cutter, sind Fie. 8, n feceView of e port-ion ct' n double Lhelical wheel.

The :iront plete .'.l .is secured hy screws to the hecdstock 2, whichudupted to slide vertically, und opcrnted in e lincliner such esdescribed in the hclfcre nuincd speci iczition. Within the interior ofheadstocl: is mounted n spur wheel 9^, rolnted by :r pinion, und iniront oit'gseic. wheel'is n dish "i, from which projects u stud Ei,cu'rryingg u block l() engaging with c. slet ll :termed in thereciproentcd pilule ii, enrried nhle guide ways such us Si, sec tl thnton the rotation olf suplir wheel ,3^ und disk i', plete (l is reciprtnfelhc wheel blnnlc-Mnot shown hy the drewl ingsmuy he supported,interl'nittently rotilted und slid in the runnncr :is shown unddescribed in hei'ore mentioned iin., ,ilicetioit The cutter slides 'l2are mounted und. fecit-4 roeuted in suiteble guide n'ztys icrnled in thefront pinto l, to these slides my im 'proved cutters ure uttnched.

EL pin 15:5 znfojccts l'iforn the bueh' oit eeeh cutter slide 12, euchpin cnrryiitgjf` u.. hloch lfl, engaging with the iuu'ztive slots iyshown by dotted lines in vli il, :uid luil lines .in Fig'. il, so thatns will on the reeiprocution ot fehlte t3, cutter slides l?) ure cruisedlo slide in "leir respective guide wuys.

'lln `ter slides ure :it the suine :ingle tu.; the teeth of the llouhlei rdicci. Wheel, when cut, such :is shown hy l" "1 recipx-ocation, oneo'le the tutti' s vuncing in the direclitni lor .,ultiug, und the othercutter receding 'l'ron'l the central plane il? of wheel periphery, thunmelting; alternate cuts.

'The cutters ure olt the rech type pattern, hut of novel construction,the teeth und spaces being ungulnr to the rcrlieufi, cre cured toordinary lool ho.` s liti, connec' with 'the sliding pluies lill. .filecutters nrc so ndiiulied ihrll` lhe louer edge .li`L ot irech tooth,when slidindu; in the tui-wird di lernlinnles in thi ter li et the l'heobvious,

ieri litt? of Wneel face, leaving the apex or junction of the twoangular oitions of each tooth ci Wheel intact, Witgout damaging ordeetioying the desired continuity of the metal forming the Wheel teeth,extending to looth sides es shown by Fig. S, v

The angle of the teeth T endlA spaces S of the cutters are the same astlie angle of the eutterslide *guide ways in plate l, 4and the cuttingfece est 16B of each cutter' tooth is et or .about at'i'ight angles tothe teeth T sind Spaces S, and the line ci movement of cutters. On theforward' movement, the lower edge 16* ci each cutter terminates esbetere stated et the central plane 17 of the periphery of Wheel, thenppenedge of the teeth passing the pointed apex 17A of? vthe Wlieelteeth Without interfering with the cortent shape 4of the teetli` et thejunction be# tween the two vangles of encli'tooth.

The cross section throngh. each tooth of' the cut/tere, is the same esan oiclinery sin-I ijle cuttei* euch es is commoniy 'insect by planingen@ teeth generating machines, so that by forming the cutter teeth andspaces at en tingle as shown, the teeth of double helical wheels may be'cut by the sliding cutters Loeoem making alternate cuts from each sideof the vslowly and intermittently rotating Wheel blank, the spaces beingcut and the teeth generated by the angular formed cutters in e mannersomewhatsiinilznr to cutting the teeth of spur Wheels by an ordinarycutter suoli as described in the Ibefore named specification. l'

What l claim as my invention is zft cutting tool for cutting the teethof double vhelical Wheels, comprising a body portion having :L pluralityof angular teeth formed integral therewith nucl arranged in e row along;one edge thereof, seid teeth being'euitebly spaced tipest, and inclinedat fan. angle corresponding to the wheel teeth to be entitle cuttingfece of each toot-l1 being formed, et right angles to the teeth and theline 'o movementgof the cutters, substen' tielly es desciibecl. l

ln Witness whereof l have hereunto'iset my henri in the pesenee of twoWitnesses. een eminent Ann.

'li/witnesses Mumien' li/lnctny, only GLLL.

